Rooftop support



FIG. 1 is a perspective of a rooftop support;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left elevational view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings indicate environmental structure which forms no part of the claimed design. 

CLAIM The ornamental design for a rooftop support, as shown and described. 